CN104234737A

CN104234737A - Enzymolysis-boosted coal-seam methane desorption technique and method

Info

Publication number: CN104234737A
Application number: CN201310246621.3A
Authority: CN
Inventors: 肖栋; 严小新; 梁艳娜
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-06-21
Filing date: 2013-06-21
Publication date: 2014-12-24

Abstract

The invention relates to an enzymolysis-boosted coal-seam methane desorption technique and method. According to the technique and method, activated protease is injected into a coal seam, thereby modifying the surface structure of a coal mass, decreasing the ability of the coal mass to adsorb methane and boosting methane analysis. Meanwhile, little carbon dioxide is produced when the protease acts with the coal mass; according to the feature that the ability of the coal mass to adsorb the carbon dioxide is far greater than to adsorb the methane, the coal-seam methane desorption speed is further increased under the action of enzymolysis. The technique and method has the advantages that the coal-seam methane extraction rate can be increased by more than 30%, methane extraction concentration can be increased by 200-300%, the technique and method is applicable to quick treatment of the coal-seam methane, and the technical level in comprehensive use of the coal-seam methane can also be increased.

Description

Enzymeization promotes coal-bed gas desorption technique and method

Technical field

The present invention relates to a kind of based on microbial enzyme turn into under coal-bed gas fast desorption technology and method.The method can reduce the characterization of adsorption of coal surface to methane and carbon dioxide in the short time, thus realizes the quick extraction of coal-bed gas.

Background technology

Coal-bed gas serious threat Mine Safety in Production.Gas pumping is one of project of mining safety industry primary study with safety always.With the progressively maturation of extraction technology, desorption of mash gas rate and the effective extraction rate of gas become one of bottleneck of mine gas extraction skill upgrading.

A kind of imflammable gas that gas is mainly formed in coalification course, it discharges in a large number along with the exploitation in colliery.Can there is secondary disaster when gathering suitable concentration in quantity, another harm of gas is burning and blast.Such as gas explosion, when the gas density of underground mining release reaches certain critical point time, in case of flammable naked light can explode; For gaseous mine, then likely there is gas and coal dust explosion accident simultaneously.No matter which kind of explodes, and all to mine with surprise attack, will lead to serious disaster.Industrial accident is increased.Also have a kind of because exploitation, in mining process due to gas in a large number, to gush out fast and the disaster effect that formed is exactly Gas Outburst.Along with the increase of coal mining depth, the increase of gas bearing capacity, define in coal seam under geostatic stress effect, under the graviational interaction of gas release, make rockburst break through burden, a large amount of gas of abrupt release and coal and a kind of geological disaster of causing.

At present, technically all there is large quantifier elimination at mine gas prevention and control both at home and abroad, particularly at extraction technical elements, although these technology have a great development, still have a lot of incomplete place, also have a lot of technical barrier.With regard to conventional gas drainage under suction, set up gas pump station on ground, the pipeline system that draws out methane through down-hole is holed with extraction and is connected, and causes negative pressure, is extracted out by gas, send into gas pot or directly supply user during pump running.As less in extracted gas quantity out, or very unstable, can directly be discharged in air.But gas belongs to a kind of stronger greenhouse gases, directly enters air and can cause another kind of disaster again simultaneously.

For ensureing to produce, improve gas drainage under suction ability, promoting gas control level becomes one of important directions of current mine safety industry research.Wherein, improve desorption of mash gas speed, promote coal seam permeability, the coal-bed gas level in control production process causes the interest that people are more and more many.The method of adding activating agent at present in coal seam water is applied in mine gas Treatment process will have very important directive significance.

In sum, improve coal bed gas extraction effect, reduce the mine of bringing due to gas and threaten and need to organize work for the following aspects with environment pollution:

1. improving desorption of mash gas rate is the basic of raising gas pumping effect;

2. improving methane gas content in gaseous mixture is solve low concentration gas to utilize difficult primary condition

" coal surface enzymeization promote short technology " goes through in conjunction with domestic and international Duo Jia research institution a kind of novel synthetic agent that effort in 4 years develops.It can improve desorption of mash gas rate, accelerate gas pumping speed simultaneously, effective raising mash gas extraction concentration, and can guarantee that process coal-bed gas there will not be methane to contain rate phenomenon repeatedly for a long time, be coordinate current extraction technology to improve gas pumping effect, promote a kind of novel product that mine gas administers level.

Summary of the invention

The present invention is intended to turn use into by enzyme, changes the gas sorption ability of coal body, reduces the adsorptivity to methane and carbon dioxide, thus improves a kind of technical method of gas pumping speed and efficiency.

This technology has possessed following characteristics:

1. technology is introduced bioengineering and enzyme and is turned use into, and by the reaction of protease in coal seam, change coal body is to the characterization of adsorption of methane and carbon dioxide.

2. combine with technique carbon dioxide displacement principle, coal seam characterization of adsorption after treatment significantly reduces not is lose adsorption capacity completely.Process the coal seam that has to carbon dioxide adsorption performance far away higher than the adsorption capacity to methane, after enforcement gas pumping, biocoene can be controlled and generate a small amount of carbon dioxide filling cracks in coal seam space, utilize the difference of characterization of adsorption to reduce the effective characterization of adsorption of coal seam to methane further.

3. in this technology implementation process without the need to operations involving high pressure, safety is high.

4. there is not corrosivity, toxic component in the medicament etc. that processing procedure adopts, is perfectly safe to workman and environment.

5. governance process can not cause the pollution of lithic drainage, can not cause the secondary pollution etc. of surrounding enviroment.

6. the desorption rate improved in coal seam in a disguised form improves methane concentration in mash gas extraction, make the low concentration gas being difficult to utilize become and can not only be reduced greenhouse gases formula by the direct combustion gas resource directly used as Unconventional forage, effectively can improve resource utilization in addition.

technical scheme

The technical scheme adopted is as follows respectively:

1, coal body enzyme processing procedure:

In media, inject " protease desorption of mash gas accelerator ", a kind of structural membrane can be formed in coal seam under accelerator effect, reduce the intermolecular force of coal surface and adsorbable gas molecule.Under this kind of separation layer effect, can reduce the adsorption capacity of dump methane and carbon dioxide, adsorption equilibrium is destroyed, and the adsorptive pressure under synthermal condition raises, and desorption of mash gas speed is accelerated.

The ion component of protease desorption of mash gas accelerator is as Fig. 1:

2, carbon dioxide displacement effect forming process:

With the prolongation that gas drainage under suction and enzyme turn into, Coalbed Methane reduces gradually.About methane concentration in space, coal seam is lower than 20% level, accelerator can the activity of active fermentation bacterium.This kind of microorganism can generate a small amount of carbon dioxide in coal seam.Enzyme process due to coal can only reduce the characterization of adsorption of coal, can not shield the absorption property of coal completely.Simultaneously, coal to the adsorption capacity of carbon dioxide far away higher than methane, when the gas concentration lwevel in space, coal seam is suitably improved, relative to methane under equal pressure condition, coal surface will be progressively amplified the advantage of carbon dioxide adsorption, the adsorption equilibrium of methane is changed due to the change of gas concentration lwevel, again promotes the desorption process of methane.

the stabilization process of Coalbed Methane:

After completing above-mentioned two processes, coal bed methane concentration can be less than less than 5% (lower than the aerial explosion limit of methane).Now need to utilize stabilizing agent to stablize methane content.Stabilizing agent plays two effects: the first, the stability of the separation layer of regular coal seam Surface Creation; The second, suppress the activity of coal bed microorganism, play microbial ecological control action, prevent the possibility owing to generating biological methane under the bacterial classification effects such as methane backeria.

In stabilizing agent, elemental composition is as Fig. 2:

By above three steps, namely complete the implementing procedure of " enzymeization promotes coal-bed gas desorption technique ".

the beneficial effect of patent of the present invention is:

1., by enzyme process and carbon dioxide displacement technology, more conventional for coal-bed gas desorption rate negative pressure exhaust technology can be improved 30%.

2. improve the effective extraction of gas, improve methane concentration in extraction gaseous mixture, effectively solve the concentration that draws out methane low, the problems such as exploitation value value difference.

3. reduce discharge of methane, reduce the emptying of greenhouse gases, reduce environment pollution.

4. can stop the later stage due to the methane concentration problem repeatedly under absorption reason and microbial action, make coal bed methane concentration be in low-level, reduce the threat that gas causes mine safety.

5. the generation of the carbon dioxide in second stage needs methane concentration just to start under control lower than 5%, and the total growing amount of carbon dioxide is lower than 0.5m3 coal per ton, and carbon emission can not be caused to pollute.

6. this technology can be applicable to the methane process of different ranks of coal layer simultaneously.

Claims

1. enzymeization promotes coal-bed gas desorption technique, it is characterized in that: stablize the integrated technology combined with the multiple technologies such as coal bed microorganism flora suppression in conjunction with the enzyme process of coal, carbon dioxide displacement and coal body characterization of adsorption.

2. the enzyme process of the coal described by right 1, is characterized in that generating a kind of barrier film by protease to the effect on coal surface, weakens coal surface and adsorbable gas molecule intermolecular forces.

3. the carbon dioxide displacement effect described by right 1, is characterized in that the metabolism utilizing microorganism, generates biological methane in the microfissure in coal body.

4. the carbon dioxide described by right 3 generates, and it is characterized in that carbon dioxide generative process possesses process control, the characteristic of controllable amount.

5. the coal body characterization of adsorption described by right 1 is stablized, and it is characterized in that utilizing stabilizer element, the stability of firm barrier film, can not fast hydrolyzing.

6. the coal bed microorganism flora described by right 1 suppresses, it is characterized in that carrying out special project for coal bed microorganism flora community structure characteristics suppresses, prevent the generation of biological methane and the carbon dioxide caused due to the effect of the microorganisms such as methanogen, hydrolysis bacterium, zymophyte, sulfate reducing bacteria.

7. the coal bed microorganism flora described by right 1 suppresses, and it is characterized in that, by suppressing microbial activity, reducing the generation of biogas, thus the new Gas Disaster likely caused under being reduced in newborn methane effect.

8. the coal bed microorganism flora described by right 1 suppresses, and it is characterized in that, by suppressing microbial activity, reducing the generation of biogas, thus being reduced in the generation of newborn carbon dioxide, reduce carbon emission.